Printech Archive, February, 1998
Re: Treatment of Wastewater for Reuse; Flexo Printer


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From: Tom Blewett (BLEWETT@epd.engr.wisc.edu)
Date: Wed Feb 04 1998 - 20:46:18 CST


Wayne,

If bacteria are the primary issue in the treated waste water after
the solids have been removed, could reverse osmosis be used. I know
the the City of Des Moines, Iowa which draws municipal drinking water
supplies from river water uses RO and the usual chlorination. The
river water is subject to significant erosion and runoff from farms
in the area, including some bacteria. It would seem that the flexo
shop needs to accomplish some of the same purification objectives in
this illustration.

From: "Wayne Pferdehirt" <pferdehi@epd.engr.wisc.edu>

Would appreciate any suggestions that might help a flexographic
printer that UW is assisting decrease wastewater:

BACKGROUND:
The company is a flexographic printer, manufacturing primarily
printed kraft paper bags (grocery sacks, take-out bags, etc.) All
inks used are water-based. The company is not connected to a
municipal sewer system. Only sanitary wastes are discharged to the
on-site septic system; other wastewater must be trucked to a
municipal wastewater treatment plant, at considerable expense.

There is considerable wastewater from cleanup of the paste makeup and
 cooking operations, and from ink cleanup. Presently, wastewater is
pretreated through precipitation and vacuum drum to remove solids,
and effluent is trucked to wastewater treatment plant.

THE CHALLENGE:
The company would like to increase its reuse of wastewater. They
tried in the past, but said that remaining bacteria in the wastewater
caused problems with paste makeup. Said the bacteria caused the
paste to break down and lose strength.

Any experience and suggestions from Printech users that might help
identify improvements that would help company to successfully treat
wastewater to enable reuse for paste makeup?


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